/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.fuseki.servlets;
import static java.lang.String.format ;
import java.io.IOException ;
import javax.servlet.ServletOutputStream ;
import org.apache.jena.atlas.web.MediaType ;
import org.apache.jena.atlas.web.TypedOutputStream ;
import org.apache.jena.fuseki.Fuseki ;
import org.apache.jena.fuseki.HttpNames ;
import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.NodeFactory ;
import org.apache.jena.riot.Lang ;
import org.apache.jena.riot.RDFDataMgr ;
import org.apache.jena.riot.RDFLanguages ;
import org.apache.jena.riot.ReaderRIOT ;
import org.apache.jena.riot.system.StreamRDF ;
import org.apache.jena.riot.system.StreamRDFLib ;
import org.apache.jena.sparql.core.DatasetGraph ;
/**
* Servlet that serves up quads for a dataset.
*/
public class REST_Quads extends SPARQL_REST
{
public REST_Quads() { super(); }
@Override
protected void validate(HttpAction action)
{
// already checked?
}
@Override
protected void doGet(HttpAction action)
{
MediaType mediaType = HttpAction.contentNegotationQuads(action) ;
ServletOutputStream output ;
try { output = action.response.getOutputStream() ; }
catch (IOException ex) { errorOccurred(ex) ; output = null ; }
TypedOutputStream out = new TypedOutputStream(output, mediaType) ;
Lang lang = RDFLanguages.contentTypeToLang(mediaType.getContentType()) ;
if ( lang == null )
lang = RDFLanguages.TRIG ;
if ( action.verbose )
log.info(format("[%d] Get: Content-Type=%s, Charset=%s => %s",
action.id, mediaType.getContentType(), mediaType.getCharset(), lang.getName())) ;
if ( ! RDFLanguages.isQuads(lang) )
errorBadRequest("Not a quads format: "+mediaType) ;
action.beginRead() ;
try {
DatasetGraph dsg = action.getActiveDSG() ;
RDFDataMgr.write(out, dsg, lang) ;
success(action) ;
} finally { action.endRead() ; }
}
@Override
protected void doOptions(HttpAction action)
{
action.response.setHeader(HttpNames.hAllow, "GET, HEAD, OPTIONS") ;
action.response.setHeader(HttpNames.hContentLengh, "0") ;
success(action) ;
}
@Override
protected void doHead(HttpAction action)
{
action.beginRead() ;
try {
MediaType mediaType = HttpAction.contentNegotationQuads(action) ;
success(action) ;
} finally { action.endRead() ; }
}
static int counter = 0 ;
@Override
protected void doPost(HttpAction action)
{
if ( ! action.getDatasetRef().allowDatasetUpdate )
errorMethodNotAllowed("POST") ;
// Graph Store Protocol mode - POST triples to dataset causes
// a new graph to be created and the new URI returned via Location.
// Normally off.
// When off, POST of triples goes to default graph.
boolean gspMode = Fuseki.graphStoreProtocolPostCreate ;
// Code to pass the GSP test suite.
// Not necessarily good code.
String x = action.request.getContentType() ;
if ( x == null )
errorBadRequest("Content-type required for data format") ;
MediaType mediaType = MediaType.create(x) ;
Lang lang = RDFLanguages.contentTypeToLang(mediaType.getContentType()) ;
if ( lang == null )
lang = RDFLanguages.TRIG ;
if ( action.verbose )
log.info(format("[%d] Post: Content-Type=%s, Charset=%s => %s",
action.id, mediaType.getContentType(), mediaType.getCharset(), lang.getName())) ;
if ( RDFLanguages.isQuads(lang) )
doPostQuads(action, lang) ;
else if ( gspMode && RDFLanguages.isTriples(lang) )
doPostTriplesGSP(action, lang) ;
else if ( RDFLanguages.isTriples(lang) )
doPostTriples(action, lang) ;
else
errorBadRequest("Not a triples or quads format: "+mediaType) ;
}
protected void doPostQuads(HttpAction action, Lang lang)
{
action.beginWrite() ;
try {
String name = action.request.getRequestURL().toString() ;
DatasetGraph dsg = action.getActiveDSG() ;
StreamRDF dest = StreamRDFLib.dataset(dsg) ;
ReaderRIOT reader = RDFDataMgr.createReader(lang) ;
reader.read(action.request.getInputStream(), name, null, dest, null);
action.commit();
success(action) ;
} catch (IOException ex) { action.abort() ; }
finally { action.endWrite() ; }
}
// POST triples to dataset -- send to default graph.
protected void doPostTriples(HttpAction action, Lang lang)
{
action.beginWrite() ;
try {
DatasetGraph dsg = action.getActiveDSG() ;
// This should not be anythign other than the datasets name via this route.
String name = action.request.getRequestURL().toString() ;
//log.info(format("[%d] ** Content-length: %d", action.id, action.request.getContentLength())) ;
Graph g = dsg.getDefaultGraph() ;
StreamRDF dest = StreamRDFLib.graph(g) ;
ReaderRIOT reader = RDFDataMgr.createReader(lang) ;
reader.read(action.request.getInputStream(), name, null, dest, null);
action.commit();
success(action) ;
} catch (IOException ex) { action.abort() ; }
finally { action.endWrite() ; }
}
protected void doPostTriplesGSP(HttpAction action, Lang lang)
{
action.beginWrite() ;
try {
DatasetGraph dsg = action.getActiveDSG() ;
//log.info(format("[%d] ** Content-length: %d", action.id, action.request.getContentLength())) ;
String name = action.request.getRequestURL().toString() ;
if ( ! name.endsWith("/") )
name = name+ "/" ;
name = name+(++counter) ;
Node gn = NodeFactory.createURI(name) ;
Graph g = dsg.getGraph(gn) ;
StreamRDF dest = StreamRDFLib.graph(g) ;
ReaderRIOT reader = RDFDataMgr.createReader(lang) ;
reader.read(action.request.getInputStream(), name, null, dest, null);
log.info(format("[%d] Location: %s", action.id, name)) ;
action.response.setHeader("Location", name) ;
action.commit();
successCreated(action) ;
} catch (IOException ex) { action.abort() ; }
finally { action.endWrite() ; }
}
@Override
protected void doDelete(HttpAction action)
{ errorMethodNotAllowed("DELETE") ; }
@Override
protected void doPut(HttpAction action)
{ errorMethodNotAllowed("PUT") ; }
@Override
protected void doPatch(HttpAction action)
{ errorMethodNotAllowed("PATCH") ; }
}